Boiler and the like



April 22 1930. T. E. MURRAY BOILER AND THE LIKE Filed April 20,

25 awwmioz 720mm? 5 Mar/0y 3351 M a v Patented Apr. 22, 1930 UNITED? STATES THOMAS 1E. MURRAY; or- 'CBROOKLYN, NEW YoRK; JOSEPH" BRADLEY MURRAY,

PATENT FFICE;

'rHoMA s E. MURRAY, JR, Alvin JOHN'- MURRAY EXnoUToRsor SAID- THOMAS E.

JVLURRA Y, DECEASED BOILER, AND THE LIKE.

Appficati-onfiled. April 20, 1925. Serial No. 24,435.

My invention aims to provide certain improvements applicable to boilers generally and particularly to boilers such as are used for. generatingsteam or hot water for heatinglpurpose's. I

The accompanying drawings illustrate embodiments of the invention. I

Fig. 1, is a vertical section of. a boiler approximately on the line 11 of Fig. 2

Fig'QEZ is ,alongitudinal section, of the same approximately ,011 the line 2-2 of Fig.1; V 1 Fig 3is a horizontallsection approximately on the. line; 3- 3 of. Fig. 2 and looking, upward as indicated by the arrows.

' Thegboilerl is made/in: one ornore sections each comprising a topplate 1 and outer side plates 2,. which atv their lower, endsare bent inward and upward to form plates 3v spaced from the-outer plates to, provide legs 4 const'ituting' water enclosures at the sides of the furnace in which any usual or suitable grate 5 is provided resting on brackets 6 on the inner sides of the plates 3. The upperends of the plates 3 are bent over the furnace in the form of elongated convolutions 7 and 8, the spaces between which flare outward at their lower ends so that the plates are exposed throughout substantially their entire height to the direct radiant heat of the coal 9 on the grate. In this way the heating surfaces are most efliciently placed. The radiant heat from the fire is many times as efiective as the convected heat, conveyed by the gases of combustion to the heating surfaces. For example, in the ordinary water tube boiler, consisting of tiers of tubes one above the other, the lowest tier, which is exposed to the radiant heat, does from 65% to 80% of the work while the small remaining fraction is done by the upper tiers which receive practically nothing but the" convected heat through the gases of combustion. In my arrangement the gases ofcombustion also wipe against the heating surfaces, but the chief advantage is in the exposure of practically the entire heating surfaces to the direct'radiant heat of the fire.

The water vessel above described'may be economically made of plates welded or otherwise connected to each other at their edges. 'Or the entire cross-section may be of a single plate beginning at the middle of the top Wall 1 and extending across the top, down one side, up and across the top of the furnace in the shape shown and thence down and up the other side and across the top to the middle where itis joined to the first edge by weldingor otherwise; the ends being closed by separate end plates 10, Fig. 2. Any desired number of convolutions, 7, 8 may be provided in the upper part of the heating surface, according to the width of "the furnace, and other considerations, and the convolutions'may be in other proportions heating surface thereof is exposed to the direct radiant heat of the fire. The area of the. heating surfaces may be increased by forming vertical corrugati'ons'll in the walls '7, and 8,.whieh serve also to stiffen these walls. Or separate stiffeners may hex-welded on: the plates 7 and- 8, which would also-increase the area of the: heating surfaces; 7'

To :use the combustion gases more efli- .ciently,, -there may be provided also in: the upperportions of. the spaces between the plates? and 8,,baffles 12 and13open at opposite'ends so that the gases will be forced to follow'the sinuous path indicated inFig. 2 leading finally to the outlet flue 14;.

The water lever is shown at 15 above the upper ends of the plates 7 and 8, which ends 1 are preferably: stiffened by posts 16 extending therefrom to the top'wall 1-. For better circulation in the'upper part of the water the upper ends of the convolutions may be bent down to form troughs 17 and 18 at the front and-back. For the-same reason, theelow point .between the plates 8 communicates at the ,back of, the boiler with-a. pipe 1 9-which1 is connected at its-lower end with a transverse circulating pipe '20 the branches of which connect with the lower ends of the Water vlegs 4. From the, middle of the pipe 20 a branch 21 (Fig. extends tothe outside to .provide a waterinlet and blowbfi. The .steam passes out of the Water receptacleby a a pipe 22 at the top. t v

The water receptacle instead of being in' and shapes provided that all or most of the a single piece from end to end may be made in a number of sections joined end to end so as to make a boiler of any desired length from front to back. Thebaffles may be omitted Where the upper ends of the convolutions are so close to the fire that they will work more efiicientlyby direct exposure to the radiant heat therefrom. And various other arrangements may be made for securing an easier circulation of the water.

When used as a boiler alone, I prefer to surround the principal parts of the water chamber with air insulation. I have 1llustrated an insulating construction which is advantageous in connection with this boiler and also with various other types of boiler. A metal wall 23 is arranged to surround the water receptacle at the sides and ends and preferably also at the top, leavingan air space within. Spacers 24 are provided at intervals composed of insulating material. In the space within the wall 23 there may be mere dead air serving for insulation, or

a circulation of air may be provided for with outlets to the furnace so as to provide heated air for combustion. lVhere the air is used for combustion it will be economical in some cases to provide a second metal wall 25v outside of the wall 23 with a space between them for dead air serving solely as insulation and thus ensuring the maximum heating effect on the air used for combustion. 7

The heating of water will be somewhat more rapid in parts of the boiler than in others owing to a greater intensity of the fire and of the bed of coal. This greater intensity of the heating and the more rapid evaporation of the water will normally occur in the central part of the boiler and furnace as a result of the more rapid boiling in the central part of the boiler, the water rising with the bubblesof steam will be thrown upwardly, the level of the water being in effect lifted at this part of the boiler. In this manner the water may be thrown over the upper edges of the walls 7 and 8 and into the compartments at the outside of the partition 7 the water thus displaced from the central compartment between the walls 8 together with the water lost by evaporation is replaced by water circulating from the outer compartments of the boiler. By means of the depressions 17 and 18 a freer path for the circulation of the water is provided and the circulation is localized at the extreme ends of the boiler, thus causing a 7 straight sweep downwardly, then centrally and upwardly to the central station. The free sweep and circulation of the water thus obtained greatly facilitates the transfer of heat from the interior of the furnace into the circulating water by increasing the convection effects, particularly in the film closely adjacent the heat transferring walls ofthe boiler. It will be understood, however, that other arrangements of the depressions may be made and other paths of circulation thereby created.

Though I have described with great particularity of detail certain embodiments of my. invention, yet it is not to beunderstood therefrom that the invention is restricted to the particular embodiments disclosed. Va rious modifications thereof may be made by those skilled in the art without departure from the invention as defined in the following claims.

What I claim is:

1. A boiler having a water receptacle which is substantially rectangular inplan and the bottom of which is formed in Vertical convolutions extending lengthwise from end to end ofthe receptacle, the upper portions of said convolutions being bent downward through a portion of their length to form transverse troughs which facilitate circulation of water.

2. A boiler having a water receptacle which is substantially rectangular in plan and the bottom of which is'formed in vertical convolutions extending lengthwise from THOMAS E. MURRAY. 

